Authorization was built for sessions, not intent.
OAuth scopes tell a system which API an agent may call. They say nothing about a $4,000 ceiling, an approved vendor list, or whether this purchase still falls inside what the user actually asked for.
AUTHORITY AND SETTLEMENT FOR AUTONOMOUS AGENTS
Your agent can act.Now prove it wasallowed to.
Grantline issues scoped, signed mandates that define exactly what an agent may do — and enforces them at the moment money moves. Any counterparty can verify one in 40 milliseconds.
LIVE VERIFICATIONONLINE
Agent
mandate presented
Grantline
signature valid · within limits
Counterparty
accepted
Settlement
captured $412.00
mnd_31ba7ed2551938 ms
0 ms
median mandate verification
0
constraint types per mandate
0%
of actions written to an append-only ledger
0
agent credentials stored on your servers
THE MISSING CONTROL PLANE
Agents broke the assumption that the buyer is a person.
The counterparty is flying blind.
A merchant receiving an agent-initiated order has no standard way to confirm the agent represents the account holder, or that the order sits within granted authority. Most respond by blocking agents entirely.
Nobody can reconstruct what happened.
When an agent buys the wrong thing, the evidence is a model transcript. That is not an artifact anyone can settle a dispute against.
HOW IT WORKS
Authority that travels with the action.
Issue a mandate.
The principal — a user or an organization — grants scoped authority to a specific agent. Constraints cover amount, merchant, category, geography, time window, velocity, approval thresholds, and single-use versus recurring.
Present it.
The agent attaches the mandate to its request. The signature travels with the action; nothing sensitive is copied into your infrastructure.
Verify and enforce.
The counterparty calls verify. Grantline checks the signature, the revocation state, and every constraint against the live request, then returns an allow or deny with a reason.
Settle and record.
Funds move against the mandate through hold, capture, or escrow for delivery-conditional purchases. Every step lands in an append-only ledger with a hash chain.
CAPABILITIES
A boundary agents cannot reason around.
Scoped mandates
Nine constraint types, composable, expressed as data rather than prose.
Instant revocation
Kill an agent's authority globally in one call. Propagates in under a second.
Spend controls
Per-transaction, per-merchant, per-period, and velocity ceilings, enforced at authorization rather than reconciled after the fact.
Conditional escrow
Hold funds until delivery, completion, or a signed receipt, for agent-to-agent and agent-to-merchant transactions.
Tamper-evident ledger
Every issuance, presentation, decision, and settlement hash-chained and exportable for audit.
Human-in-the-loop approvals
Anything above a threshold pauses and routes to the principal, with the full request context attached.
SPEAKS THE RAILS YOUR COUNTERPARTIES ALREADY USE
Stripe · Visa · Mastercard · ACH · Card networks · Stablecoin settlement · OAuth 2.1 · Webhooks · MCP · OpenTelemetry · SDKs for TypeScript, Python, Go
Emerging agent-payment standards are converging. Grantline is designed to issue and verify across them rather than compete with them.
IF YOU BUILD AGENTS
Ship autonomy without raw credentials.
Give users a dial they understand — how much, where, for how long — and a revoke button that actually works.
IF YOU ACCEPT AGENTS
Verify authority before you fulfill.
Stop treating agent traffic as fraud, and keep a record that survives a chargeback.
PRICING
Start at the verification layer.
DEVELOPER
$0
- 10,000 verifications per month
- All nine constraint types
- Test-mode settlement
- Community support
SCALE
$499/month + 0.4%
- Unlimited mandates
- Live settlement and escrow
- 99.95% uptime SLA
- Ledger export
- Email support with a 4-hour response target
PLATFORM
Custom
- Volume pricing below 0.15%
- Dedicated verification region
- Private ledger attestation
- Onboarding support for your counterparties
Verification is always free for the counterparty. The side asking for authority pays for it.
FAQ
Questions of authority.
A CONTROL PLANE FOR AUTONOMY
Autonomy is a permissions problem.
Give agents room to act and a boundary they cannot cross.
Get started